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Colin S McCoin1,2,3, Edziu Franczak1, Michael P Washburn4

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Acute exercise rapidly remodels liver mitochondria proteins, impacting fatty acid metabolism, inflammation, and oxidative stress. This study reveals exercise

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Area of Science:

  • Exercise physiology
  • Mitochondrial biology
  • Proteomics

Background:

  • Exercise profoundly impacts tissue energy metabolism, driven by mitochondrial function.
  • Liver mitochondria are crucial for fueling glucose output during exercise.
  • The effects of acute exercise on the liver mitochondrial proteome are not well understood.

Purpose of the Study:

  • To investigate the changes in the hepatic mitochondrial proteome following a single bout of exercise.
  • To identify exercise-induced alterations in mitochondrial proteins, including those targeted for degradation.

Main Methods:

  • Proteomic analysis of isolated hepatic mitochondria from female mice immediately and 2 hours after a 1-hour treadmill exercise bout.
  • Utilized leupeptin, a lysosomal inhibitor, to capture proteins destined for degradation.
  • Analyzed 3241 identified mitochondrial proteins using functional enrichment and t-SNE analysis.

Main Results:

  • Exercise significantly altered proteins involved in lipid localization, IL-5 signaling, and protein phosphorylation.
  • Identified four distinct protein expression clusters influenced by exercise and leupeptin treatment.
  • Exercise modulated fatty acid metabolism, post-translational modifications, inflammation, and oxidative stress pathways.

Conclusions:

  • Acute exercise induces rapid and extensive remodeling of the hepatic mitochondrial proteome.
  • Exercise influences mitochondrial pathways related to metabolism, inflammation, and stress response.
  • The study provides insights into the dynamic changes within liver mitochondria during physical activity.